In the first six months of the 111th Congress, 235 caucuses in the House of Representatives registered formally with the Committee on House Administration as Congressional Membership Organizations. Since the beginning of June, 16 more CMOs have followed suit, bringing the current count of caucuses in the House of Representatives to 251. That’s more than one caucus for every two members of the House.

The formation, dissolution and relative activity of these caucuses is worth following, since they indicate the range and boundaries of active legislative interest in the Congress, and the transparency of various efforts. Who is willing to sign her name down as a devotee of an issue or constituency? To share information about the development of House caucuses over time, I note below the names of these 16 newly registered caucuses below, indicating caucus websites and lists of members where available. Where caucus information is not made available to the public, I’ve made note of that, too. Ask yourself why some issues go public while others remain cloaked. These caucuses have been added to our accumulated list of caucuses in the House for your broader reference.

Anti-Value Added Tax Caucus: no website and no meetings; secondary website with list of members maintained by Americans for Tax Reform

Congressional Baby Caucus: recruitment letter; no primary website; list of members

Congressional Caucus on the European Union: no primary website; secondary website with list of members maintained by the Center for Transatlantic Relations at Johns Hopkins University

Congressional Composites Caucus: no primary website, no list of members; secondary website maintained by the American Composites Manufacturing Association

Congressional Contaminated Drywall Caucus: no website, no list of members

Congressional Former Mayors Caucus: no website, no list of members

Congressional Healthy Forest Caucus: no website, no list of members

Congressional Hydropower Caucus: no website, no list of members

Congressional Media Fairness Caucus: website; no list of members

Congressional Motorcycle Caucus: no website, no list of members

Congressional Port Security Caucus: no website, no list of members

Congressional Romania Caucus: no website, no list of members

Congressional Timber Caucus: no website, no list of members

Congressional Zoo and Aquarium Caucus: no website, no list of members

Pediatric Cancer Caucus: no website, no list of members

Rural Veterans Caucus: no website, no list of members